antepenultimate

1. The 3rd syllable of a word counting back from the end (synset 106316213)
   is a type of: syllable - a unit of spoken language larger than a phoneme
   same as: antepenult, antepenultima

1. Third from last (synset 301019532)
   similar to: intermediate - lying between two extremes in time or space or state

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